Whirlpool AccuBake Oven Temperature Dropping Mid-Bake:... | appliancefaults.com

Technical Background:

The Whirlpool AccuBake™ system relies on the oven control board (MCU) to regulate the heating elements. The MCU receives input from the oven temperature sensor (RTD) and adjusts the voltage supplied to the bake and broil elements accordingly. A drop in temperature indicates a disruption in this feedback loop or a problem with the heating elements themselves. The voltage path goes from the breaker to the control board then to the element. The RTD sends a signal to the board in ohms.

Symptoms:

The homeowner observes that the Whirlpool AccuBake™ oven reaches the set temperature initially, but the temperature drops significantly during the baking process, resulting in unevenly cooked food. The bake time is extended, and the oven may struggle to maintain the desired temperature.

Possible Causes:

Weak bake element.
Faulty oven temperature sensor (RTD).
Malfunctioning oven control board (MCU).
Poor door seal causing heat loss.
Inadequate voltage supply to the oven.
Incorrect oven calibration.

Solution:

1

Disconnect power to the oven at the breaker panel. Verify 0V AC at the oven receptacle using a multimeter.
2

Inspect the bake element for breaks or blisters. Measure resistance with a multimeter; a typical bake element reads between 15-50 ohms. If open, replace the bake element.
3

Test the oven temperature sensor (RTD) resistance using a multimeter. At room temperature (75°F), it should read approximately 1080-1090 ohms. Consult the service manual for specific values and replace if out of range.
4

Check the oven door seal for damage or gaps. Replace if necessary.
5

Verify the voltage supply to the oven using a multimeter while the oven is running. It should be 240V AC (+/- 10%). If low, investigate the breaker panel and wiring.
6

Access the oven's diagnostic mode (refer to the service manual or online resources for the specific sequence, often involving button presses) and check for error codes. Calibrate the oven temperature if needed, following the manufacturer's instructions.
7

After replacing any parts, run a bake cycle and monitor the temperature with an oven thermometer to ensure the oven is maintaining the set temperature.

Safety Warning:

Disconnect power to the oven at the breaker panel before performing any repairs. Lock Out / Tag Out (LOTO) the breaker to prevent accidental re-energization. High voltage is present in the oven wiring; use caution when testing electrical components.

Prevention:

Periodically clean the oven interior to prevent food buildup. Inspect the door seal regularly and replace it if it becomes damaged. Avoid overloading the oven, which can affect temperature distribution. Calibrate the oven yearly.

Expert Tip:

Many Whirlpool ovens have a hidden service mode. Pressing 'Cancel,' then 'Cancel' again, followed by 'Start' will often enter the diagnostic mode, allowing for advanced testing and calibration.

Frequently Asked Questions

•What is the acceptable resistance range for the RTD at different temperatures?

The resistance of the RTD varies with temperature. Consult the Whirlpool service manual for the specific model to find the resistance chart. At room temperature (75°F), it's typically around 1080-1090 ohms. At 350°F it could be around 1500 ohms.

•How do I access the diagnostic mode if the 'Cancel, Cancel, Start' sequence doesn't work?

The diagnostic mode access sequence varies by model. Check the owner's manual or search online for the specific sequence for your Whirlpool AccuBake™ oven model number. It may involve pressing other button combinations.

•If the voltage to the oven is low, what are the possible causes besides the breaker?

Besides the breaker, a loose connection in the wiring between the breaker panel and the oven receptacle, a damaged or undersized wire, or a problem with the electrical service coming into the house from the utility company could cause low voltage. Have a qualified electrician inspect the wiring.

Whirlpool AccuBake Oven Temperature Dropping Mid-Bake: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the acceptable resistance range for the RTD at different temperatures?

•How do I access the diagnostic mode if the 'Cancel, Cancel, Start' sequence doesn't work?

•If the voltage to the oven is low, what are the possible causes besides the breaker?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: